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The docs (built from the equivalent Terraform docs) don't explicitly say, but I infer that this has to be done outside Pulumi: https://www.pulumi.com/registry/packages/aws/api-docs/ram/principalassociation/

Provides a Resource Access Manager (RAM) principal association. Depending if RAM Sharing with AWS Organizations is enabled, the RAM behavior with different principal types changes.

👍 Will do that

And https://www.pulumi.com/registry/packages/aws/api-docs/ram/resourceassociation/

NOTE: Certain AWS resources (e.g., EC2 Subnets) can only be shared in an AWS account that is a member of an AWS Organizations organization with organization-wide Resource Access Manager functionality enabled. See the Resource Access Manager User Guide and AWS service specific documentation for additional information.

could easily write a dynamic provider for this I think

Since it's once-and-once-only per account, even that might be more effort than needed...

For me it’s not worth it, as it’s just:

aws ram enable-sharing-with-aws-organization

but for pulumi it would be a nice-to-have, as you can stay in the code

It's more likely to come to AWS Native than AWS Classic. Might already be there, in fact?